<!DOCTYPE html>
<html lang="en"> 
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
    div span{
        color: royalblue;
    }
    span{
        color: saddlebrown;
    }
    span ~ p{
        color: red;
    }
    </style>
</head>
<body>
   <div>
       <span>烧鸭肉不错</span>
       <p>烧鸭肉也不错</p>
   </div>
   <span>但是我现在吃不到</span>
</body>
</html>